from sys import stdin
def main():
    #入力
    readline=stdin.readline
    x,y,h=map(int,readline().split())
    x*=10**3
    y*=10**3

    count=0
    while True:
        if x<=y:
            if h<x:
                x/=2
                h*=2
                count+=1
            elif h<y:
                y/=2
                h*=2
                count+=1
            else:
                break

        elif y<x:
            if h<y:
                y/=2
                h*=2
                count+=1
            elif h<x:
                x/=2
                h*=2
                count+=1
            else:
                break

    print(count)
if __name__=="__main__":
    main()